The next day, on a yacht outside the port, Lin Rui and Lincoln were equipped. They were all wearing expensive flask wetsuits, but they were not equipped with bulletproof armor, and they had no weapons on them except for a ******. This in itself was not a surprise mission, but a highly covert infiltration mission.

Lin Rui pressed the headphones and said in a low voice, "Cobain, signal test." ”

"Normal. Cobain tapped on the computer, "But maybe there's a signal shield inside the shop." You have to be adaptable. ”

"Understood. Lin Rui turned around and continued, "Actuary, how is Sergei doing now?"

"He had already entered the periphery of the factory and was mixing in with the workers, queuing up to go to work. He looks really good in his overalls. Shogan chuckled under his breath.

Lin Rui nodded, "Okay, I'll leave it to you here." Lincoln, let's go down. He put the mask on and fell into the water.

Lincoln swam over from the other side and gestured to him underwater. Lin Rui replied to him with a gesture, and then the two of them each took off a small underwater thruster from the back of the yacht. This thruster is also the smallest and lowest noise thruster in the Russian frogman weapon system.

Two people held the thrusters and swam forward underwater like seals.

Due to this plant and the base of large nuclear submarines, it is basically one. In particular, the nuclear submarines in the base are a symbol of the strategic nuclear forces of the entire country and have an important military role and strategic value.

In wartime, it is the target of the enemy's key blockade, strike, sabotage, and control, and may face multiple attack threats at any time, including the sea and the air. Therefore, it is necessary to guard against hard strikes by the enemy's precision-guided weapons, soft strikes by the enemy's electromagnetic interference, and sneak attacks by the enemy's underwater frogmen and torpedoes. Therefore, safety protection is an important consideration in the construction of such submarine bases.

Whether it can be safely infiltrated, even a veteran like Lincoln has no bottom in his heart. Because there are many kinds of prevention against frogman infiltration in this kind of place, and most of them belong to passive defense, such as setting up anti-submarine nets or anti-frogman facilities, the most troublesome is the anti-frogman sonar system.

However, when Lin Rui and others made plans, they took this layer into account. Both he and Lincoln were equipped with an advanced reconnaissance instrument.

This British-developed instrument is a new type of underwater navigation and search system for frogs, which was originally used for frogmen to operate underwater and clear mines. This new "frogman reconnaissance system" has a high-frequency forward-looking sonar search capability, and uses very accurate navigation technology and data recording equipment to assist anti-mine operations, especially for operations in shallow coastal areas.

Carried by frogmen and operated manually. The system also incorporates a microprocessor technology that is able to receive sensor data and measure and display mission information. All system functions are controlled by frogmen via small tactical slabs that are waterproof at a distance of 50 meters.

Usually, in order to be able to better destroy mines, the use of frogmen is a very good way to fight. After the ship is equipped with a mine or a mine-like weapon, frogmen can be used to further verify and destroy them. In addition, large anti-mine equipment is not suitable for anti-mine operations in shallow coastal areas, while frogmen can use some simple anti-mine equipment to search for and destroy mines.

But Lin Rui and the others used it to reconnoiter the surrounding situation. A faint blue glow flashes on the underwater tactical slab, revealing the outline of the underwater object in front of it. Lincoln gestured to Lin Rui, and on his tablet, he showed multiple sonar nodes set up in different waters and distances from the coastline, most of which were hidden in the submarine reef or the entrance and exit of the harbor. A complete chain of underwater sonar defense was formed.

"Anti-frogman sonar system. Lin Rui's heart moved slightly. However, he is not worried, Russia is not very clever at anti-frogman sonar. In fact, the only reliable system in the world that can detect closed-breathing frogmen from a long distance is the frogman detection sonar DDS system, which was recently completed by the Israeli company DSIT Technologies.

The DDS system can maintain the lowest false alarm rate under the conditions of strong marine noise and aquatic reverberation, with an average of only about once a week. Russia's sonar system may work wonders for frogmen who are more dynamic and use open breathing apparatus. But for frogmen like Lin Rui and Lincoln who carry closed breathing devices, there are some deficiencies.

But even then, it means that they have to abandon underwater propulsion. Because if you go forward with underwater thrusters, they will be almost 100% visible under the influence of the noise of the thrusters. Lin Rui and Lincoln turned off the thruster and threw it underwater. Then dive forward like a fish, trying to keep your movements as light as possible, and slowly move forward with the swing of your flippers.

Judging from Lincoln's current sonar node, the Russians' anti-frogman sonar monitoring is not very far away, as long as they successfully dive forward at a distance of four or five hundred meters, they can get out of the sonar monitoring area.

Just when Lin Rui and the others were sneaking underwater, Sergei also ran into some trouble. At the entrance to the factory, they not only have to swipe their cards to verify their identity, but they also have to go through security gates. This made Sergei a little unprepared, because there was no mention of a security gate outside the factory.

Sergei lowered his head, pressed his headphones and whispered, "Guys, I'm in trouble. Security checks have been added to the entrance to the factory, which have not been mentioned before. I don't have weapons on me, but communication equipment is a problem. Their security checks make it mandatory for everyone to hand over their phones. If I find out, I will most likely be exposed. But I can't give up my communication equipment. ”

"Don't be nervous, our communication equipment is about the same as a regular mobile phone. And they can't unlock the view, it's hard to see the difference if you're not a professional. Cobain whispered over the radio. "I really can't do it, so I will hand over the communicator and take the time to get it back. ”

"No, it's too risky. Shogishi whispered, and he whispered through the wireless channel, "Sergey, can you manage to bring the communicator in without attracting attention?"

"I'll give it a try. Sergei looked at the checkpoint in the distance and replied in a low voice. Then, he took off his communication headset and continued to follow the team.

"It's impossible, it's too dangerous, you have to get him to give up going in with the communicator. Tefnut said to Shogan with some anxiety.

Without the communicator, he would not be able to get in touch with Lin Rui and them. "He won't be able to work together, and he won't be able to accept the orders we convey here." ”

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